hakimel/reveal.js — pull request #344 by jmikola (2013-02-21 19:23:01+00:00)
Title: Set PDF output to letter landscape, no margin

CSS3 property, described in some more detail here: http://stackoverflow.com/questions/138422/landscape-printing-from-html.

I've been using this for some time to get full-page PDF output in Chrome.